send a confirmation with form data to the user

I look for a javascript script for web forms where send a confirmation with form data to the user that submit the form(to email address entered) .

Javascript can't do what you want. You will need a server side language to have the info sent to you. Check to see what server side languages your host supports, e.g. php, asp, asp.net, jsp, perl.

php SUPPORTS MY SERVER , TELL ME WHERE TO FIND THIS IN PHP ?

There is no need to yell. Search on www.hotscripts.com for such script. Search for formmail or autoresponder.